coolant lines / throttle body
01-02-2018, 10:47 AM
#61
Team Owner
I agree with you about the subjective part, not debating that at all. Back in my competition days, people would swear certain brand rifles/shotguns would kick harder, regardless of action. It was all BS. But, to go from not being able to touch the plenum to touching the plenum pushes a little beyond subjectivity. Coolant temps would run 210-215 on a stock HD rad system. Bypassed the TB and started seeing 185-195. 30 degrees (at the extremes) is enough to feel a difference for sure. Grumpy wrote up a nice article on it, showed some pretty convincing evidence it makes a difference. Not saying its 100 HP, but why not try and run nice cooler air to your engine
After marrying a young beautiful girl, a ninety year old man told his doctor that they were expecting a child.
"Let me tell you a story," said the doctor. "There was an absent minded fellow who went hunting one day, and instead of taking a gun, brought his umbrella. Before he realized his error, a bear charged him. He aimed his umbrella at the bear, shot and killed him on the spot."
"That`s impossible!", the geezer exclaimed. "Somebody else must have shot that bear!"
"Exactly!", replied the doctor.
"Let me tell you a story," said the doctor. "There was an absent minded fellow who went hunting one day, and instead of taking a gun, brought his umbrella. Before he realized his error, a bear charged him. He aimed his umbrella at the bear, shot and killed him on the spot."
"That`s impossible!", the geezer exclaimed. "Somebody else must have shot that bear!"
"Exactly!", replied the doctor.
Last edited by aklim; 01-02-2018 at 10:50 AM.
01-02-2018, 03:14 PM
#62
But what exactly is the effect of of the cooler TB? Much of the air charge DOES NOT contact the TB before it goes into the cylinder. What is the temperature increase as noted by the MAT sensor? After that, what is the effect it has on engine performance? Maybe a tenth of a percentage point? Maybe 1 percent? I'd highly doubt more than 5, if ever possible. It would have to be quite a bit for a SOTP dyno to pick it up.
Never said it was faster, said it idled smoother, ran better and had lower coolant temps. I’m sure it is more affected at idle on a hot day over cruise speeds since idle means a longer contact time with the TB. Not entirely sure where the disagreement is. When did cooler air become a bad thing? Not being snarky, but even if it’s fractions, you’re making a positive improvement in the engineering unless you live in ND or ME and drive in freezing temps. http://garage.grumpysperformance.com...-bye-pass.169/
01-02-2018, 03:19 PM
#63
Team Owner
Never said it was faster, said it idled smoother, ran better and had lower coolant temps. I’m sure it is more affected at idle on a hot day over cruise speeds since idle means a longer contact time with the TB. Not entirely sure where the disagreement is.
When did cooler air become a bad thing? Not being snarky, but even if it’s fractions, you’re making a positive improvement in the engineering unless you live in ND or ME and drive in freezing temps. http://garage.grumpysperformance.com...-bye-pass.169/
When did cooler air become a bad thing? Not being snarky, but even if it’s fractions, you’re making a positive improvement in the engineering unless you live in ND or ME and drive in freezing temps. http://garage.grumpysperformance.com...-bye-pass.169/
Cooler air isn't a bad thing. Whether it makes anything significant when idling is uncertain since there are no datalogs. My SOTP dyno can only process major changes so when something is not "night and day", I discount any feelings the SOTP dyno gives me. To be certain, I never noticed any major or minor change in idle quality after I did the bypass. If anything minor was noticed, I simply ignored it since it wasn't objective.
Last edited by aklim; 01-02-2018 at 03:29 PM.
01-02-2018, 04:25 PM
#65
Advanced
Just a quick question for clarification. The bypass was already done on my 94 but the PO did not cover the pipes where the hoses connect to the TB. Does it hurt not to have them covered? Living in Arizona I see no reason to hook the hoses back up.
01-02-2018, 04:38 PM
#66
Team Owner
Pro Mechanic
No. Leaving the hose fittings unplugged or uncovered won't hurt anything.
01-02-2018, 04:43 PM
#67
Team Owner
05-21-2020, 11:02 AM
#68
Pro
Way back in this thread someone posted the part # for a 90* Dayco 5/8" (#80406 48" in length) heater hose that could run directly from the front of your engine to the heater core inlet after doing the throttle body coolant bypass. Thanks
BTW if your looking for a 90* Gates 5/8" heater hose equivalent it's Gates part # 28472.
These #'s are for an L98 engine not an LT1
BTW if your looking for a 90* Gates 5/8" heater hose equivalent it's Gates part # 28472.
These #'s are for an L98 engine not an LT1
Last edited by mako41; 06-29-2020 at 09:05 AM.
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